I don't have a cab built yet, but I have MAME running on my 27" Zenith in the livingroom, The PC it's running on is a Shuttle ITX (Very Nice SMALL formfactor with sound and video integrated into the MOBO, as well as Composite & S/Video out) I'm displaying 800x600 on my TV, with no special equiptment, so I think the 640x480 limitation may have to do with the video card & not the television. By the way, It's an older S3 video chipset on my system, nothing new or fancy at all. MAME loks great, running Windows - not something you really want to do on a TV at all.